using System.Text.Json;

using System.Text.Json.Serialization;

using System;

public record class MyClass { public required int FooBar {get;set;} }

​

public class Program

{

    public static void Main()

    {

var options = new JsonSerializerOptions

{

    //PropertyNamingPolicy = JsonNamingPolicy.CamelCase

};

var jsonString = """{"fooBar":3}""";

var myObject = JsonSerializer.Deserialize<MyClass>(jsonString, options);        

Console.WriteLine(myObject);        

    }

}